title: Identification of Actinobacillus pleuropneumoniae biovars 1 and 2 in pigs using a PCR assay.
abstract: Actinobacillus pleuropneumoniae causes swine pleuropneumonia worldwide. Previously, we described a gene sequence of approximately 800bp in A. pleuropneumoniae serotype 1 that encodes a metalloprotease of 24kDa, (Genbank accession no. AY217757). We selected primers carrying the forward and reverse 5'-terminal sequences of this region of the gene for the development of a species-specific PCR assay. The primers amplified an 800bp sequence from isolated DNA and lysed bacteria of the 13 A. pleuropneumoniae biovar 1 serotypes, with the exception of subtype 1b. The primers also amplified the sequence in nasal secretion cultures from pigs with chronic and acute experimental pleuropneumonia. No PCR products were detected when A. pleuropneumoniae serotypes of biovar 2 were used. Internal primers from this gene sequence detected biovar 2 and subtype 1b, leading to the production of a 350bp PCR product. The primers did not amplify DNA from other related species from the Pasteurellaceae family. The 800bp PCR assay was sensitive in vitro, with a detection limit of 5.5pg of extracted DNA, and an average of 120CFU. The specificity and sensitivity of this PCR assay make it a useful method for the rapid identification and diagnosis of A. pleuropneumoniae.
authors.affiliation: Departamento de Biología Celular, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, México DF 07000, Mexico.
authors.forename: Luis E
authors.initials: LE
authors.lastname: Serrano-Rubio
authors.forename: Víctor
authors.initials: V
authors.lastname: Tenorio-Gutiérrez
authors.forename: Francisco
authors.initials: F
authors.lastname: Suárez-Güemes
authors.forename: Ruth
authors.initials: R
authors.lastname: Reyes-Cortés
authors.forename: Martha
authors.initials: M
authors.lastname: Rodríguez-Mendiola
authors.forename: Carlos
authors.initials: C
authors.lastname: Arias-Castro
authors.forename: Delfino
authors.initials: D
authors.lastname: Godínez-Vargas
authors.forename: Mireya
authors.initials: M
authors.lastname: de la Garza
mesh_terms: D016977:Actinobacillus pleuropneumoniae / Q000235:genetics / Q000302:isolation & purification; D000818:Animals; D001681:Biological Assay / Q000379:methods; D008969:Molecular Sequence Data; D011001:Pleuropneumonia / Q000235:genetics; D016133:Polymerase Chain Reaction / Q000379:methods*; D034421:Sus scrofa / Q000382:microbiology*